Steam generating device



1964 KAzuo ARISAWA STEAM GENERATING DEVICE 5 Sheets-Sheet 1 Filed June 6, 1962 INVENTOR. KAZl/O AK/JAWA 1964 KAZUO ARISAWA 3,162,180

STEAM GENERATING DEVICE Filed June 6, 1962 I$ 2 INVENTOR.

KHZ-U0 AF JA J M4. f ztw JTTflAA EYS Dec. 22, 1964 KAZUO ARISAWA 3,162,180 STEAM GENERATING DEVICE Filed June 6, 1962 3 Sheets-Sheet 3 INVENTOR.

KAZl/O 4054 WI United States Patent 3,162,180 STEAM GENERATING DEVICE Kazuo Arisawa, Naitano-ku, Tokyo, Japan, assignor to Fuji Boiler Co., Ltd, Tokyo, Japan Filed 'June 6, I962, Ser. No. 206,479 3 Claims. (Cl. 122-451) This invention relates to a steam generating device.

It is an object of this invention to provide a steam generating device which can generate steam immediately after the heating is started.

It is another object of this invention to provide a steam generating device which is capable of replenishing water for generating steam automatically and of controlling the amount of steam to be generated.

It is further an object of this invention to provide a steam generating device by which the damage of steam generating pipes which has been apt to be caused in the device hereto in use can be minimized and the maximum thermal efficiency can be obtained.

It is still further an object of this invention to provide a steam generating device which can obtain dry steam of high temperature, moisture contained therein being removed.

With the above recited and other objects in view, reference is made to the following specification and attached drawing in which there are exhibited embodiments of the invention which are in no way intended as a limitation upon the scope of the appended claims as it is to be clearly understood that variations and modifications which fairly fall within the scope of said claims may be resorted to when found expedient.

In the attached drawings,

FIG. 1 is a side view of a vertical section of a steam generating device according to this invention;

FIG. 2 is a side view, partly cut open, showing another embodiment of this invention;

FIG. 3 is a plan view of the device as shown in FIG. 2;

FIG. 4 is a section along the line IVIV in FIG. 2;

FIG. 5 is a front view of a dehydrating device to be incorporated with and forming a part of the device according to this invention;

, FIG. 6 is a section along the line VI-VI in FIG. 5; and

FIG. 7 is the same along the line VIIVII of FIG. 6.

Now explaining in details this invention with reference to the attached drawings, in FIG. 1, 1 is a casing having a plurality of steam generating pipes 2 arranged vertically therein, G is a gap between said steam generating pipes 2, 3 i a lower chamber connected with each of said steam generating pipes 2, 4 is an upper chamber connected likewise with each of said steam generating pipes 2, 5 is a steam pipe, 6 is a Water tank, 7 is a float which maintains the water level of said water tank 6 at a predetermined level, 8 is a Water pipe connecting said water tank 7 with the lower chamber 3, 9 is a feed pump, 10 is a jet burner provided substantially at the same height with that of the water level of said steam generating pipes 2, 11 is a partition separating the casing 1 into several sections and HG is a space between said partitions constituting a Zig-zag passage of a combustion gas.

In the above constitution, water supplied to the water tank 6 is made to enter into each of said steam generating pipes 2 in the casing 1 through the Water pipe 8 and the water level in the steam generating pipes is maintained at the same level with that of the water tank 6 and as soon as the water level in the steam generating pipes 2 is lowered, by the function of the float 7, it is automatically adjusted to the original predetermined level and thus a constant water level in the steam generating pipes can be maintained from time to time during the operation of the device.

By lighting the jet burner 10 which can be substituted by any other heating means and throwing the flame into the casing 1, the steam generating pipes 2 at around the surface of the water are heated rapidly and the Water within the pipes 2 is heated just at the surface thereof and since no convection is caused, the water at the surface is rapidly made to boil and is evaporated and the steam thus generated is then moved upwards in the steam generating pipes 2. 0n the other hand, said pipes are further heated by the combustion gas passing through the passage constituted by the partitions 11 thereby heating the steam within said pipes, which is then carried to the pipe 5 through the upper chamber 4. Thus, the device according to this invention is simple in its construction and has an excellent thermal efficiency.

Furthermore, as the heat is applied to the limited part of the pipes and the surface of the water, any scale to be generated on this part of the pipes can be separated by the repeated expansions and contractions of the part which is repeatedly soaked and dried by the boiling water in the pipes.

Furthermore, as the water within the steam generating pipes 2 is heated at the surface thereof, it comes to a boil immediately after heating and as soon as the water within the pipes is reduced by evaporation, it is automatically replenished from time to time by means of the float 7 in the Water tank 6 and thus the steam of high temperature can be generated very promptly by means of the most effective heating and the amount of steam to be generated can be adjusted by regulating the flame of the burner.

In FIGS. 2 to 4, wherein another embodiment of this invention is illustrated, 3a is a lower chamber connected to a supply pipe 8a, 4a is an upper chamber connected with a steam pipe 5a, 2111 and 2a2 are steam generating pipes forwarded in the shape of an arc, of which upper and lower ends are connected with the upper and lower chambers 4a and 3a respectively. 10a is a jet burner provided on the center line of a circle formed by the steam generating pipes 2a1 and 2a2. 1a shows a furnace body. Water supplied through the supply pipe 8a is divided into the steam generating pipes Zal and 2a2 through the lower chamber 3a and is heated by the jet burner 10a and is evaporated from the water level L shown in FIG. 4 and the steam thus generated is collected into the upper chamber 4a and is then carried to the steam pipe 5a. As the jet burner 10a is located on the center line of a circle formed by the steam generating pipes 2411 and 202, the frame of the burner always leaves a constant space with the pipes 2411 and 2a2 and it does not make a direct contact with the pipes and heats the pipes by means of a radiant heating, which is far more eifective in generating steam than the conventional method of heating from the lower side thereof. Furthermore, by varying the level of water in the steam generating pipes 2:11 and 2a2, heating area of the water within the pipes can freely be adjusted.

According to the device of this invention, as the flame does not come into contact with the steam generating pipes 2a} and 2112, the combustion gas is not cooled and the temperature within the flame can be maintained above the ignition point of the gas and thus the same is subjected to a complete combustion. Furthermore, as the flame does not come into direct contact with the pipes, they are not damaged by the flame and the duraab-ility thereof can be increased.

In FIGS. 5 to 7, wherein a dehydration device to be attached to the steam generating device of this invention is illustrated, I2 is a steam inletp-ipe having two 15 having openings 14 on both sides thereof by means,

of asteam pipe 501 att'ached .at 'the center ofsaid steam pipe Sal, which is connected with a heatingpipe extending out of said outer tube 13. 16 is an intake pipe attached to the lower part of the outer tube 13 at the center thereof and is connected with a water tank or a water supply pipe. 1 The steam which is introduced into the outer tube 13 from the intake pipe 12 through v the branch pipes 12a and 12b is projected from an opening 0 and as the opening C is tangentially attached to in said tank at a predetermined level, said tank continuously supplying liquid to the vapor generating tubes by gravity feedto said lower header.

jv 2. A device for generating steam comprising a plurality of substantially vertical steam generating pipes, upper and lowerchambers connected with said steam generating pipes, a water tank located at a level between said upper and lower chamber-s, said'lower chambersYbeing connected to said water tank, means for maintaining theliquid level in said water tank at a level to automatically; supply steam generating pipes-with water to a level 'above said'lowerchamber, and heating means arranged to heat said steam generating pipe including the outer tube 13', said steam projected from the open-; 2

ing C is made to move at a high velocity tojboth' sides circlin'g around the inner tube and further to'tlie inner tube 15 entering from the openings 14-thereof and is then moved to the steam pipe Sal.- As the wet steam is made to rotate at a high velocity withinthe' space.

between the outer and inner tubes'131and 15 as shown by arrows, before it'reaches' to the'opening 1440f the inner tube 15, by the centrifugal force of the. steam itself,

particles'having larger specific gravity are thrown. on theinner surface of thee utertube 13 and is moved to a water tank or a'sup'p-ly pipe through the intake pipe 16 and thus the moisture contained in the steam'can be removed. As the steam of which moisture has cornpl'etely be removed as above is supplied-to the'heating,

pipe, said steamcan'be ofhigh temperature and since no scale is generated onthe' surfiace of the pipe, no damage is causedon the pipe wall and thus the device according to this invention can obtain a' very high thermal efficiency.

While l ha've illustrated and described the preferred embodiments of my invention} it is to be understood that T de not limit myself-"to the precise constructions herein disclosed and the right is reservedto all changes and means to direct heating gases directly against said generating pipes at the level of water thereim 3. A'vapor generator'comprising angupper substantially horizontal header, a'lower substantially horizontal header spaced vertically downwardly therefrom, a plurality of substantiallyvertical vapor generating tubes located be, tween and connected to said upper and lower header-s, means'for directing heating gases-against the vapor gencrating tubes for generating vapor therein located at a location between said upper and lower headers, a liquid tankrlocated between said-upper andlower headers and connected above theliquidqlinetherein to said upper header and; below the liquid line therein to said lower header, meansfor maintaining the liquid level in said tank at a predetermined level which corresponds" to a 'lavelfto' maintain the level in said generating 'tubes'in modifications 'corni'ng within t-h'e scope of the invention as set forth in'the appended What I claim-is: r v I 1. A vapor generator comprising an upper substantially' horizontal'he'ader, a lower substantially horizontal claims.

header spaced vertically downwardl therefrom,"a plus rality of vapor generating tubesconnected to said upper and lower headers, means" for directing heat ag ainst-the I vapor generating tubes for "generating vapor therein at a location between said upper-Land lower headers,- a

7 liquid tank located between said upper-and lower headers and connected above the liquid line 'therein to said-i upper header and'bel'ow theliquid line therein to: said lower 1,997,535 4/35 Saunders et al 122 451 XR 2,149,477 3/39 'Trede' 122-236 r 2,1 2,950 6/39 'Hegwein 122-451 2,298,285 10/42 Fletcher 55-459 2,404,114 7/46 Waterman '1 22'451 2,822,060 2/58 UdOV iCh 55-459- 3,063,430 11/62 ROsSi '122406 7 3,070,077, 12/62 Huet 122451 header, r'n'eans for 'maintainingathe' liquid level which corresponds to alevel to maint ainlthe level in saidfgenerab. V 7 ing tubes in alignment withjsaid heat directingmeans V alignment with said meansfor directing heating gases, said tank continuously supplyin-gdiquidto the vapor generating tubes by gravity feed tosaid lower header, saidmeans for directing heating gases, against the vapor generating tubes' comprising a burner mounted between said upper and lower headers in a posiiton to direct gaseous products of' combustion directly against said vapor. generating tubes at the level of the liquid therein.

2 References Cited by the Examiner UNITED STATES PATENTS ROBERT A. ,OLE RY, Primary Examiner. PERCY PATRICK, FREDERICK: L. MATIESON, 1R2; "KENNETH w; SPRAGUE, Exa ml fieT-SL 

1. A VAPOR GENERATOR COMPRISING AN UPPER SUBSTANTIALLY HORIZONTAL HEADER, A LOWER SUBSTANTIALLY HORIZONTAL HEADER SPACED VERTICALLY DOWNWARDLY THEREFROM, A PLURALITY OF VAPOR GENERATING TUBES CONNECTED TO SAID UPPER AND LOWER HEADERS, MEANS FOR DIRECTING HEAT AGAINST THE VAPOR GENERATING TUBES FOR GENERATING VAPOR THEREIN AT A LOCATION BETWEEN SAID UPPER AND LOWER HEADERS, A LIQUID TANK LOCATED BETWEEN SAID UPPER AND LOWER HEADERS AND CONNECTED ABOVE THE LIQUID LINE THEREIN TO SAID UPPER HEADER AND BELOW THE LIQUID LINE THEREIN TO SAID LOWER HEADER, MEANS FOR MAINTAINING THE LIQUID LEVEL WHICH CORRESPONDS TO A LEVEL TO MAINTAIN THE LEVEL IN SAID GENERATING TUBES IN ALIGNMENT WITH SAID HEAT DIRECTING MEANS IN SAID TANK AT A PREDETERMINED LEVEL, SAID TANK CONTINUOUSLY SUPPLYING LIQUID TO THE VAPOR GENERATING TUBES BY GRAVITY FEED TO SAID LOWER HEADER. 